DBMS25S300 D-Sub 25 Position Receptacle Connector

Part Overview

The DBMS25S300 is a 25 position D-Sub receptacle connector manufactured by Amphenol ICC (FCI) in the DM HE501 series. This through-hole solder termination connector features female sockets in a DB/B shell size (Shell Size 3) configuration with two rows of contacts. The connector is rated for 7.5A per contact at 300V and operates across the temperature range of -55°C to 125°C. Currently active in production with 958 units in stock, this connector serves as a standard interface component in industrial and commercial applications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical compatibility, and termination methods while accounting for variations in shell finish, contact material, and regulatory compliance status.

Key Parameters

Parameter	DBMS25S300 Specification
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Shell Size / Layout	3 (DB, B)
Mounting Type	Through Hole
Termination	Solder
Current Rating	7.5A per Contact
Voltage Rating	300V
Operating Temperature	-55°C to 125°C
Material Flammability	UL94 V-0
Contact Finish	Gold
Shell Material	Steel, Yellow Cadmium Plated
Dielectric Material	Thermoplastic
Contact Material	Phosphor Bronze
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DBMS25S300 are qualified based on the following critical parameters that must match or remain compatible:

Mandatory Matching Parameters:

Connector type: Receptacle, Female Sockets
Number of positions: 25
Shell size and layout: 3 (DB, B)
Mounting type: Through Hole
Termination method: Solder
Material flammability rating: UL94 V-0
Number of rows: 2

Allowable Variations:

Current rating: 6.0A to 7.5A per contact (lower ratings acceptable for equivalent function)
Voltage rating: 100V to 300V (lower ratings acceptable)
Operating temperature range: -20°C to 125°C minimum (DBMS25S300 operates -55°C to 125°C; substitutes with narrower ranges are acceptable if application requirements permit)
Shell finish: Steel with various plating options (Yellow Cadmium, Tin, or unspecified)
Contact finish: Gold or unspecified
Dielectric material: Thermoplastic, Polyester, or Polycyclohexylenedimethylene Terephthalate (PCT)
Contact material: Phosphor Bronze, Brass, or Copper Alloy
Flange feature: Board Side, Housing/Shell (Unthreaded), Housing/Shell (4-40), or Mating Side Female Screwlock (4-40)
RoHS compliance: RoHS non-compliant, RoHS Compliant, or ROHS3 Compliant

Parameter Comparison

Parameter	DBMS25S300	L77DB25SU	09643127210	09643127230	09643127240	09663556513	1-338315-2	1-5745967-0	1-5745967-4	1-5745967-5	1-5745967-6
Manufacturer	Amphenol ICC (FCI)	Amphenol ICC (Commercial)	HARTING	HARTING	HARTING	HARTING	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Number of Positions	25	25	25	25	25	25	25	25	25	25	25
Shell Size / Layout	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Current Rating (Amps)	7.5A	7.5A	7.5A	7.5A	7.5A	6.5A	6A	6A	6A	6A	6A
Voltage Rating	300V	300V	100V	100V	100V	—	—	125V	125V	125V	125V
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-20°C to 125°C	-20°C to 125°C	-20°C to 125°C	-55°C to 125°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Material Flammability	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Contact Finish	Gold	Gold	—	—	—	Gold	Gold	Gold	Gold	Gold	Gold
Shell Material / Finish	Steel, Yellow Cadmium Plated	Steel, Tin Plated	Steel	Steel	Steel	Steel	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated
Dielectric Material	Thermoplastic	Thermoplastic, Glass Filled	Polycyclohexylenedimethylene Terephthalate (PCT)	Polycyclohexylenedimethylene Terephthalate (PCT)	Polycyclohexylenedimethylene Terephthalate (PCT)	Polycyclohexylenedimethylene Terephthalate (PCT), Glass Filled	Polyester, Glass Filled	Polyester	Polyester	Polyester	Polyester
Contact Material	Phosphor Bronze	Brass	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
RoHS Status	RoHS non-compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	958 Pcs New Original	952 Pcs New Original	694 Pcs New Original	901 Pcs New Original	912 Pcs New Original	750 Pcs New Original	4711 Pcs New Original	1489 Pcs New Original	1879 Pcs New Original	2268 Pcs New Original	4421 Pcs New Original

Engineering Selection Recommendations

Primary Equivalent (Highest Compatibility): L77DB25SU from Amphenol ICC (Commercial Products) maintains identical electrical specifications (7.5A, 300V) and operating temperature range (-55°C to 125°C) as the DBMS25S300. Both are manufactured by Amphenol ICC with the same connector geometry and solder termination. The primary difference is shell finish (Tin Plated vs. Yellow Cadmium Plated) and dielectric material composition (Glass Filled Thermoplastic vs. standard Thermoplastic). This part is RoHS Compliant and represents the closest functional equivalent.

Secondary Equivalents (Acceptable Substitution): The TE Connectivity AMPLIMITE HD-20 series (1-5745967-0, 1-5745967-4, 1-5745967-5, 1-5745967-6) provides functional equivalence with the following considerations: current rating is reduced to 6A per contact (versus 7.5A), voltage rating is 125V (versus 300V), and maximum operating temperature is 105°C (versus 125°C). These parts are suitable for applications where the lower electrical ratings and temperature ceiling are acceptable. All variants feature Phosphor Bronze contacts with gold finish and tin-plated steel shells. RoHS compliance varies: 1-5745967-0 and 1-5745967-4 are RoHS Compliant; 1-5745967-5 and 1-5745967-6 are ROHS3 Compliant.

HARTING Alternatives (Conditional Substitution): HARTING parts 09643127210, 09643127230, and 09643127240 are functionally equivalent in mechanical configuration but operate at reduced voltage (100V) and temperature range (-20°C to 125°C). Current rating matches at 7.5A. Part 09663556513 features a Mating Side Female Screwlock flange and reduced current rating (6.5A). All HARTING parts are ROHS3 Compliant. These are suitable only when application voltage and temperature requirements align with the reduced specifications.

TE Connectivity AMPLIMITE HDP-20 (1-338315-2): This part provides mechanical compatibility with reduced electrical specifications (6A current, no specified voltage rating) and narrower operating temperature range (-55°C to 105°C). It features a Housing/Shell (4-40) flange and is ROHS3 Compliant. Suitable for applications with lower electrical demands.

Regulatory Compliance Consideration: The DBMS25S300 is RoHS non-compliant due to yellow cadmium plating. All substitute parts listed are either RoHS Compliant or ROHS3 Compliant, making them suitable for applications requiring RoHS compliance. Selection should account for regulatory requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can I substitute the DBMS25S300 with L77DB25SU in my application? A: Yes. The L77DB25SU maintains identical electrical ratings (7.5A, 300V) and operating temperature range (-55°C to 125°C). Both are 25-position D-Sub receptacles with solder termination and through-hole mounting. The primary difference is shell finish (Tin Plated vs. Yellow Cadmium Plated) and dielectric material composition. Mechanical compatibility is confirmed.

Q: What is the main limitation when using TE Connectivity AMPLIMITE HD-20 series parts as substitutes? A: The AMPLIMITE HD-20 series (1-5745967-0, 1-5745967-4, 1-5745967-5, 1-5745967-6) has reduced electrical specifications: 6A per contact (versus 7.5A) and 125V rating (versus 300V). Maximum operating temperature is 105°C instead of 125°C. These parts are suitable only if your application operates within these lower electrical and thermal limits.

Q: Are HARTING parts 09643127210, 09643127230, and 09643127240 direct replacements? A: These HARTING parts are mechanically compatible 25-position D-Sub receptacles with solder termination. However, they operate at 100V (versus 300V) and -20°C to 125°C (versus -55°C to 125°C). They are suitable only for applications with lower voltage and higher minimum operating temperature requirements.

Q: What is the difference between the various TE Connectivity AMPLIMITE HD-20 variants? A: All variants (1-5745967-0, 1-5745967-4, 1-5745967-5, 1-5745967-6) share identical electrical specifications (6A, 125V, -55°C to 105°C). Differences are in flange feature and contact finish thickness: 1-5745967-0 has Housing/Shell (4-40) flange; 1-5745967-4, 1-5745967-5, and 1-5745967-6 have Mating Side Female Screwlock (4-40) flanges. Contact finish thickness varies (30.0µin, 30.0µin, Flash, and 30.0µin respectively). RoHS compliance: 1-5745967-0 and 1-5745967-4 are RoHS Compliant; 1-5745967-5 and 1-5745967-6 are ROHS3 Compliant.

Q: Does the shell finish (Yellow Cadmium vs. Tin Plated) affect electrical performance? A: Shell finish does not affect electrical performance. Both Yellow Cadmium Plated and Tin Plated finishes provide equivalent shielding and mechanical protection. Selection depends on application environment and regulatory requirements. Tin-plated variants are preferred for RoHS-compliant applications.

Q: Can I use a part with lower current rating (6A) in place of the 7.5A rated DBMS25S300? A: Only if your application current does not exceed 6A per contact. The lower current rating represents a reduced safety margin. If your design operates at or near 7.5A, substitution with 6A-rated parts is not recommended.

Q: What packaging options are available for these substitute parts? A: DBMS25S300 and L77DB25SU are supplied in Tray packaging. TE Connectivity AMPLIMITE HD-20 series parts are supplied in Tube packaging. HARTING parts are supplied in Bulk packaging. Packaging does not affect connector function but may impact handling and storage procedures.

Q: Is the DBMS25S300 RoHS compliant? A: No. The DBMS25S300 is RoHS non-compliant due to yellow cadmium plating. All listed substitute parts are either RoHS Compliant or ROHS3 Compliant. If RoHS compliance is required, L77DB25SU is the recommended direct equivalent.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant? A: RoHS Compliant refers to compliance with the original RoHS Directive (2002/95/EC). ROHS3 Compliant refers to compliance with RoHS Recast (2011/65/EU) and subsequent amendments. Both designations indicate absence of restricted substances. ROHS3 represents the current regulatory standard.

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